2XSK

E. coli curli protein CsgC - SeCys


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.239 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Extending the Usability of the Phasing Power of Diselenide Bonds: Secys Sad Phasing of Csgc Using a Non-Auxotrophic Strain.

Salgado, P.S.Taylor, J.D.Cota, E.Matthews, S.J.

(2011) Acta Crystallogr D Biol Crystallogr 67: 8

  • DOI: https://doi.org/10.1107/S0907444910042022
  • Primary Citation of Related Structures:  
    2XSK

  • PubMed Abstract: 

    The CsgC protein is a component of the curli system in Escherichia coli. Reported here is the successful incorporation of selenocysteine (SeCys) and selenomethionine (SeMet) into recombinant CsgC, yielding derivatized crystals suitable for structural determination. Unlike in previous reports, a standard autotrophic expression strain was used and only single-wavelength anomalous dispersion (SAD) data were required for successful phasing. The level of SeCys/SeMet incorporation was estimated by mass spectrometry to be about 80%. The native protein crystallized in two different crystal forms (form 1 belonging to space group C222(1) and form 2 belonging to space group C2), which diffracted to 2.4 and 2.0 Å resolution, respectively, whilst Se-derivatized protein crystallized in space group C2 and diffracted to 1.7 Å resolution. The Se-derivatized crystals are suitable for SAD structure determination using only the anomalous signal derived from the SeCys residues. These results extend the usability of SeCys labelling to more general and less favourable cases, rendering it a suitable alternative to traditional phasing approaches.


  • Organizational Affiliation

    Imperial College London, England.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CSGC110Escherichia coliMutation(s): 0 
UniProt
Find proteins for B2CY50 (Escherichia coli)
Explore B2CY50 
Go to UniProtKB:  B2CY50
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB2CY50
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.239 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.27α = 90
b = 36.15β = 117.09
c = 39.51γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling
SHELXphasing
PHASERphasing
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-12-29
    Type: Initial release
  • Version 1.1: 2012-05-30
    Changes: Database references, Version format compliance
  • Version 1.2: 2014-01-29
    Changes: Atomic model, Derived calculations, Non-polymer description, Other, Structure summary